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What is Spamhaus?

Spamhaus is an international blacklisting organization that was founded in Europe in 1998 to track spammers and spam-related activity. Spamhaus compiles and distributes six Domain Name System (DNS)-based blacklists (DNSBLs) and one domain-based blacklist (DBL). The most widely-used Spamhaus blacklist is the ZEN list, which combines all of their DNSBLs together.